One of the rankings on the College Affordability and Transparency Center released Thursday is a list of how fast college costs are going up. Among public four-year institutions, the health science center is listed as having the third greatest increase — 55 percent.

The site lists tuition as increasing from $4,481 in 2009-10 to $6,944 in 2011-12, but Will Sansom, a spokesman for the school, said in an email that the figures are incorrect because of a reporting error.

“Specifically, for one of our undergraduate programs that enrolls fewer than 10 full-time, first-time students, the Health Science Center reported a change in tuition and fees from $4,481 in 2009-2010 to $6,944 in 2011-2012,” he said. “In actuality, the program costs increased 8.7 percent, from $6,389 in 2009-2010 to $6,944 in 2011-2012.”

He said the data for the health science center, which mostly enrolls professional graduate students, “is skewed by a few first-time students in a single program, which is our paramedic training program.” The health science center’s medical and dental schools, for instance, have been ranked among the most affordable in the country.

In 2011, the school refuted a similar ranking when the USDOE site incorrectly listed it as charging the highest “net price” for freshmen. At the time, President William Henrich said the school did not enroll freshmen. An Education Department spokeswoman said that data had been self-reported by the universities.